Spring-scale.



No. 676,480. Patented ll lllfi I8, l90l.

0. WIESE.

SPRING SCALE.

(Application filed ieb. 15, 1900.) I (No Model.) V 2 Sheets-Sheet l.

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Patented 1.... I8, lam.

0. j WIESE.

SPRING SCALE.

(Application filed Feb. 15, 1900.)

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INVENTOI? BY EYS (No Hudel.)

WITNESSES: i L) RAUL) nu: will: In:ns.co..mmmoo.. wnumown, a, c.

UNITED STATES r ra rueri OTTO W'IESE, OF NEW YORK, N. Y., ASSIGNOR TOTHE COMPUTING- SCALE COMPANY, OF DAYTON, OHIO.

SPRING-SCALE.

SPEGIFIGA'IION formingpart of Letters Patent No. 676,480, dated June 18,1901.

Application filed February 15, 1900. Serial No. 5,325. (No model.)

To all whom it maycon'cern:

Be it known that I, OTTO'WIESE, a citizen of the Empire of Germany,residing in New York, in the borough of Manhattan and State of New York,have inventedcertain new and useful Improvements in Spring- Scales, ofwhich the following is a specification.

A serious objection heretofore experienced in the practical use ofspring-scales of the wellknown type is that they do not weigh uniformlyand accurately at all temperatures. The flexibility and length of thesprings used vary with variations in" the temperature, and this impairsthe correctness of the result when weighing at other than normaltemperature. In cold weather the counterbalancing-springs employedcontract and will not be flexed by a given load to the same degree thatthey would be flexed by the same load in hotweat-her.

The object of this invention is to provide means whereby the influenceof temperature on the counterbalancing-springs, as made manifest by theindicating mechanism of the scales, may be neutralized and a moreaccurate weighing action secured. c

, The invention consists of a spring-balance scale having theusualrunner, suspensionhook, and counterbalancing-springs,with continuationsof said counterbalancing-springs connected with the fixed support andmovable supports interposed between the fixed support and saidcontinuations, with means for adjusting said movable supports toregulate the flexure of the springs under load in accordance with theprevailing temperature.

The invention consists, further, incertain novel details of constructionand combinations and arrangements of parts, which will be fullydescribed hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a front elevation ofmy improved spring-scale. Fig. 2 is a front elevation of the same withthe'dial removed, showing the interior mechanism. a Fig. 3 is a Viewsimilar to Fig. 2, but on a larger scale and with certain parts removed;and Fig. 4 is a vertical transverse section o'nline 4 4, Fig. 3.

1 .Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the 'vailing temperature.

oblong casing of my improved spring-scale, which is made of suitablecast or sheet metal or other suitable material and provided with flangesa at its sides for attaching the dial D thereto and at its upper endwith asuspension-rin g a. The hook a from which the pan or article to beweighed is suspended, is applied to the lower end of a T-shapeds1idepiece or runner O, which is guided in a recess at the lower end ofthe casing and to the up per ends of which are applied the lower ends ofthe counterbala'ncing-springs E. The fixed support for thecounterbalancing-springs is the casing, the connection being preferablymade at the center through intermediate substantially horizontalextensions of the counterbalancing-springs, adapted to be flexed by theload, but preferably in the form of a fiat spring F, centrally connectedwith the cas- 7o ing, and to which the upper portions of the springs Eare loosely connected by adjustable suspeusion-pins e. The extensions Fof the counterbalancing-springs may be conveniently termedregulating-springs, and they are extended horizontally and made flat inorder to provide for a more convenient form of adjust-able supportingmechanism, whereby the flexure of the springs under load may be variedinaccordance with the pre- The adjustable supports are formed byslide-blocks f f, underlying the arms of the regulating-spring F andthrough the interiorly-threaded openings in the lower part of whichpasses an adjusting compound screw-spindle G, which is journaled in thecasing and at the outside of the same is provided at one end with ameans whereby it may be turned, preferably consisting of anoperatingbutton or knob g'. The blocks ff slide upona supporting-bracket g,secured to the casing, and support in their recesses f theregulating-spring E. One of the blocks is provided with adownwardly-extending arm f which is pivotally connected with 9 5 aspring-pressed rack-bar 1, that meshes with a pinion 1", the shaft 3 ofwhich turns in suitable bearings of the casing and of a bracket 0*,attached thereto. To the squared end of the shaft is applied a graduateddisk H, which is preferably divided at its circumference into onehundred degrees. The blocks ff are ad- I justed by turning thescrew-spindle G, the

disk being thereby also turned in.one direction or the other. Athermometer 'I is arranged, preferably, on thedial of the springscale orin any other convenient location for indicating the temperature. Afterthe temperature has been noted the screw-spindle is turned by its knobuntil the number on the disk H corresponding to the temperature appearsin the opening h, provided in the dial for this purpose. Simultaneouslywith the adjustment of the disk to the number corresponding with thedegree of temperature the blocks are shifted and the length. of thesprings adjusted, whereby they will flex under the load to the properdegree in accordance with the prevailing temperature. For adjusting thesprings to lower temperatures the blocks are moved toward each other, so

that the spring will be -more flexible. In warm weather the blocks aremoved away from each other, so that a smaller length of the springextends beyond each slide-blockf, whereby the spring is rendered lessflexible.

From the foregoing it will be seen that by adjusting the length of thespring projecting beyond its support the degree of flexure under loadmay be varied to overcome variation due to change in temperature, andthe scales may be set by the user to weigh correctlyat any desiredtemperature.

It will be notedthat there is no bodily adjustment of thecounterbalancing-springs, as that would cause the indicator to move awayfrom itszero-point when no load was on the runner and would defeat theobjects of the present invention.

The T-shaped slide-piece Cis connected by a rack-bar G with a pinion p,to the shaft 19 to which. the pointer 19 is applied, which passes overthe dial and indicates thereby the weight of the article suspended fromthe hook a. tudinal rod 0 Therod is guided in lugs of the T- shapedslide-piece O and adjustable against the tension of a helical spring 8',that is interposed between the lug s on the slidepiece 0 and collar 8applied to the same by means of a screw-nut S, which is applied to thelower threaded 'end of the longitudinal rod 0 This permits the accurateadjustment of the pointer to 0. To the lugs of the T- shaped slide-pieceC is applied a supplementary graduated plate D, which is provided withgraduations from .0 to 30. The graduations are so arranged that O on theplate is in line with the lower part of thecasing when the pointer 19 isat 0 on the I dial and no load is on the scale. This plate D serves, inconnection'with the dial, for indicating the full weight after thepointer has passed more than once around the dial of the spring-scale.

Having thus described m i nvention,what I claim as new, and desire tosecure by'Lett'ers Patent, is- Y 1. In spring-balance scales, thecombina- The rack-bar is pivoted to a longition with the frame andrunner, of counter balancing-springs for the runner and load saidsprings being connected with the frame and adjustable supportsinterposedbetween the frame and springs'whereby the length of spring subjected toflexure when loaded may be varied to compensate for variations due tochange in temperature; substantially as described.

2. In spring-balance scales, the combina- I tion with the frame andrunner, of counterbalancing-springs connected with the frame, supportsadjustable along said springs to vary the length of spring subject toflexure without moving the springs bodily, and means for simultaneouslyadjusting said supports;

substantially as described.

3. In spring-balance scales, the combination with the frame and runner,of pendulous counterbalancing springs having substan* tially horizontalend continuations and horizontally-adjustable supports cooperating withsaid continuations to vary the length of spring exposed for flexureunder the influence of.

load; substantially as described.

'4. In spring-balance scales, the combination with the frame and runner,of pendulous counterbalance-springs having substantially horizontal endcontinuations interposed be- ;tween their upper ends and the frame, and

means for varying the flexibility of said sub- 7 istantially horizontalend continuations; substantially as described.

7 5. In spring-balance scales, the combination with the frame andrunner,- of pendulous counterbalance-springs having substantially 7horizontal end continuations interposed be tween their upper ends andthe frame, and supports for said substantially horizontal continuationsadjustable lengthwise thereof to vary the length of end exposed forfiexure iwhen load is applied; substantially as de-' scribed. v v x 6.In spring-balance scales, the combination with the frame and runner, ofpendulous "counterbalance-springs, substantially horizontal endcontinuations thereof looselyconnected with said pendulous springs andinterposed between said springs and the frame,

and means for varying the flexibility of said substantially horizontalcontinuations; substantially as described. 7

7. In spring-balance scales, the combination with the frame and runner,of pendulousv counterbalance-springs, substantially horizontal endcontinuations thereof loosely and adjustably connected with saidpendulous springs and interposed between said springs and the frame, andmeans for varying the .flexibility of 'said' substantially horizontalcontinuations; substantially as described.

8. In spring-balance scales, the combination with the frame and runner,of pendulous counterbalancesprings, substantially hori- =zontal endcontinuations thereof, horizontally-adjustable supports for saidcontinuations to varythe length exposed for flexure and a singleoperating mechanism for said ment of the supports; substantially asdesupports whereby they may be silnultanescribed. ously adjusted;substantially as described. In testimony that I claim the foregoing as9. In spring-balance scales, the combinamy invention I have signed myname in pres- 5 tion with the frame and runner, of pendulous ence of twosubscribing witnesses.

counterbalance -springs substantially horizontal end continuationsthereof, horizon- V OTTO WVIESE' tally-adjustable supports for saidcontinua- Witnesses:

tions to vary the length exposed for fiexure PAUL GOEPEL,

to and an indicator for indicating the adjust- M. H. WURTZEL.

